T43 T43p

 

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Instructions on how to actually unlock your ThinkPad (TP) are in the User's Guides

EEPROM Location and Type

T43 T43p EEPROM you treat it as LSI

Locating the T43 connection points

Switch the T43 OFF.

You should have already downloaded the hardware Maintenance Manual for your ThinkPad model, if you have not done so use the link below to download it now,

Download the Hardware Maintenance Manual (HMM) for your TP model

The links above are to the Lenovo site, if it doesn't work, don't panic, it isn't broken, their site is shut down daily for maintenance and at those times they display spurious messages like the page you requested cannot be found, wait a good while and try again.

For most T43s (Except Types 187x), here are the locations: - for Type 187x see further down this page

An easy to get to connection point on T43 is in the Memory Bay underneath the T43

Carefully examine the 3 connections points above.

You are checking to make sure there is clean metal to contact later with the probes that will be pushed onto those points.

If there is a film coating the copper pads or the metal looks tarnished then carefully scrape it with a sharp blade to just remove the film or tarnish, take care we just need a small clean area to make contact with the sharp probes later.

If your T43 has a fingerprint scanner then disconnect the fingerprint scanner.

A more difficult connection point to access

Once you have your T43 HMM search the manual for "Removing and replacing a FRU" then scroll down to 1060 Keyboard, it's on Page 80 of the manual,  follow the instructions in the manual to lift up the keyboard, leave it plugged in just move it forward toward you to reveal the connection points.

You should now be able to see U63, see photos below.

The connections we will use are near U63, just under the RAM module if one is fitted.

You will need to have some RAM in the T43 for use later when we switch it ON, no don't switch it ON just now, later OK.

If there is no RAM in the other DIMM slot, the one underneath the T43, then you will need to remove the RAM from above U63 and install it in the optional DIMM socket underneath the T43.

That other DIMM socket is illustrated on page 182 of the manual, item 2, undo the single screw on the cover to gain access.

If there is already RAM installed in the other DIMM socket underneath the T43 then you can just leave it there.

If there is no RAM installed in the other DIMM socket underneath the T43 then remove the RAM from under the keyboard and install it in the DIMM socket underneath the T43, later when all the work is done reverse the procedure.

The RAM is held by 2 clips one on each side

Use one finger nail on the end of each clip to pull the clip aside

DON'T BEND THEM, just pull it out sideways just enough so the RAM pops up, then you can remove it. 

You must pull both clips at the same time, 

use one finger from one hand to pull on one clip
and a finger from your other hand to pull on the other clip AT THE SAME TIME
 and the RAM will pop up ready to be removed.

To install RAM into a DIMM socket start with the RAM at angle of 45 degrees to the board [note the RAM can only go in one way there is a key slot that is not in the middle, it only fits one way].

Holding the RAM at 45 degrees to the board insert the RAM into the socket, make sure it is in all the way, if it wont go in don't force it, turn it over till the key slot matches the socket. Hold it into the socket and slowly fold it down flat until the two clips snap over it to lock it in place.

 

Or your T43 may look like this, in which case the connections are as depicted

For Types 187x, here are the locations:

For T43 with Intel 915GM (System Board FRU: 39T0324 and replacements)

Types: 1871. 1872, 1873, 1874, 1875, 1876

You should have already downloaded the hardware Maintenance Manual for your ThinkPad model, if you have not done so use the link below to download it now,

Download the Hardware Maintenance Manual (HMM) for your TP model

The links above are to the Lenovo site, if it doesn't work, don't panic, it isn't broken, their site is shut down daily for maintenance and at those times they display spurious messages like the page you requested cannot be found, wait a good while and try again.

Carefully examine the 3 connections points above.

You are checking to make sure there is clean metal to contact later with the probes that will be pushed onto those points.

If there is a film coating the copper pads or the metal looks tarnished then carefully scrape it with a sharp blade to just remove the film or tarnish, take care we just need a small clean area to make contact with the sharp probes later.

If your T43 has a fingerprint scanner then disconnect the fingerprint scanner.

See my page on Options for Clips and Probes including making your own probes.

I receive many emails asking about the GND connection, in reality it is very simple, you use some kind of a clip so that you don't have to hold it in place, you DON'T HAVE 3 HANDS and there are 3 connections, GND SDA and SCL, so have a clip for GND, then you can use the 2 hands YOU DO HAVE to hold your SDA and SCL probes in place.

Almost any large piece of metal or the screws for the external connectors of any ThinkPad are a good GND connecting point.

Anyway a picture is worth a thousand words

Click here for pictures of GND Connections

Basically you make the System board functional outside of it's case [IF you had to remove the System Board] which includes mounting heat sink and fan on CPU. Basically you make the System board functional outside of it's case [IF you had to remove the System Board] which includes mounting heat sink and fan on CPU. Basically you make the System board functional outside of it's case [IF you had to remove the System Board] which includes mounting heat sink and fan on CPU. Basically you make the System board functional outside of it's case [IF you had to remove the System Board] which includes mounting heat sink and fan on CPU. Basically you make the System board functional outside of it's case [IF you had to remove the System Board] which includes mounting heat sink and fan on CPU.

Once you have taken care of the GND connection.

You push the sharp probes onto SCL SDA , this is the reason you need 2 persons, not enough hands to hold the probes and run the software.

This is not easy, you will need to have the Keyboard [and optionally the LCD] plugged into the system board in such a way that none touch any contacts on the system board, use paper as an insulator to keep things from electrically shorting out, later you will need to plug in the AC adaptor and switch ON the TP, then you will need to hold 2 probes in place to the SCL and SDA points on the system board.

See my page on Options for Clips and Probes including making your own probes.

This page ONLY describes how to connect the KeyMaker Interface to the EEPROM.

The instructions on how to Recover or clear a Supervisor password are in The "User's Guides" click here

Assembling your TP - AFTER - you have finished.

Follow the Hardware Maintenance Manual [FRU System Board], very carefully, double check screw type and size for each individual module.  Assemble the TP in the reverse order used to dismantle it.

If you have any questions, email Joe at

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